SNCR acoustic wave temperature measurement partitioned injection system

An SNCR acoustic wave temperature measurement injection system comprises an acoustic wave temperature measuring unit, a data processing and evaluating unit, an SNCR storage unit, an SNCR delivering unit, an SNCR injecting unit, and an SNCR control unit. Through acoustic wave temperature measurement, the temperature of the whole cross section of a hearth can be measured, the cross section is divided into different areas, the measured average temperature of each area is fed back to the control unit so as to insert or pull out a spray gun of an SNCR system; and ammonia water (or urea) can be sprayed into an boiler at a most proper temperature in a self control mode. Spray guns are arranged on three layers of the boiler from top to bottom, and according on the signal of acoustic wave temperature measurement, ammonia water (or urea) is sprayed by the spray gun with the most suitable temperature. The system has the advantages that the using amount of reducing agent is reduced during the operation process of the SNC